MySQL 해커랭크 | Symmetric Pairs (셀프 조인) 문제https://www.hackerrank.com/challenges/symmetric-pairs/problem?isFullScreen=true Symmetric Pairs | HackerRankWrite a query to output all symmetric pairs in ascending order by the value of X.www.hackerrank.comTwo pairs (X1, Y1) and (X2, Y2) are said to be symmetric pairs if X1 = Y2 and X2 = Y1Write a query to output all such symmetric pairs in ascending order by the value of X. List the rows suc.. 이전 1 다음
